#app{ width: 100vw; height: 100vh; background:url(img/bj.png);
    *{  box-sizing: border-box;}
    .flex{ display: flex;}
    .flexb{ display: flex; justify-content: space-between;}
    .flexbc{ display: flex; justify-content: space-between; align-items: center;}
    .flexc{ display: flex; justify-content: center;}
    .flexcc{ display: flex; justify-content: center; align-items: center;}
    .flexci{display: flex; align-items: center;}
    .slh{
      white-space: nowrap;
      text-overflow: ellipsis;
      overflow: hidden;
      display:block;
    }
}
